Title : ( Effects of different precursors on size and optical properties of ceria nanoparticles )

Cerium oxide, ceria (CeO2), is one of the favourable nanoparticles (NPs) that possesses many remarkable
properties so that it can be used in medicine, chemistry, environment, energy, information, industry, and
so on. In this study, the crystalline ceria NPs were successfully prepared by an efficient microwaveassisted
heating technique from an aqueous solution using different cerium salts (Ce(IV) and Ce(III) salts).
The products were characterized by X-ray powder diffraction (XRD), transmission electron microscope
(TEM), FTIR spectroscopy, Raman spectroscopy, and UV-vis absorption spectroscopy. The results revealed
that changing the precursor led to great effects on size, band gap energy, and the reaction time of
preparing the ceria NPs. The significant feature of this manuscript is that the effects of different
precursors on the structural and optical properties of ceria NPs were investigated for the first time. The
average particle size of different samples was below 8 nm.